ClinicalTrials.gov provides free access to information on clinical studies for a wide range of diseases and conditions. Studies listed in the database are conducted in 175 countries

Prefix

clinicaltrials

Alternative Prefixes

clinicaltrial ctgov NCT

Keywords

disease drug human

License

https://clinicaltrials.gov/about-site/terms-conditions#availability

Links

Homepage

Contact

ClinicalTrials.gov Helpdesk

Pattern for Local Unique Identifiers

Local identifiers in ClinicalTrials.gov should match this regular expression:
^NCT\d{8}$

Example Local Unique Identifier

NCT00222573   Resolve

Pattern for CURIES

Compact URIs (CURIEs) constructed from ClinicalTrials.gov should match this regular expression:
^clinicaltrials:NCT\d{8}$

Example CURIE

clinicaltrials:NCT00222573

A summary of the relations in the Semantic Farm schema can be found here.

In Collection

FHIR External Terminologies Clinical Trial Registries Synapse.org external links

The metaregistry provides mappings between the Semantic Farm and other registries. There are 5 mappings to external registries for this resource with 2 unique external prefixes.

A provider turns a local unique identifiers from a resource into a URI. Many providers are also resolvable as URLs (i.e., they can be used in a web browser).

The local unique identifier NCT00222573 is used to demonstrate the providers available for ClinicalTrials.gov. Some providers may use a different example, which is displayed in the table below. A guide for curating additional providers can be found here.

Additional providers curated in the Semantic Farm are listed here. These are typically inherited from Identifiers.org or Prefix Commons, and need extra curation.